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The ms1 mutation in soybean: involvement of gametes in crosses with tetraploid soybean

The ms1 mutation in soybean: involvement of gametes in crosses with tetraploid soybean

Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 80(2): 172-176

Previous studies indicated that ms1ms1 malesterile female-fertile soybean (Glycine max [L.] Merr.) plants can produce seeds with different ploidy levels. The codominant chlorophyll-deficient mutant y11 was used in attempts to understand the embryo-endosperm relationship in seed production in ms1ms1 plants and to determine the mechanism of gamete formation in the ms1 mutation. Crosses were conducted between yellow-green male-sterile plants (ms1ms1Y11y11) and green fertile tetraploid cultivars (Ms1Ms1Ms1Ms1Y11Y11Y11Y11) in the greenhouse in the summers of 1987 and 1988. A total of 2,007 cross-pollinations were made. Thirty hybrid seeds were obtained, and plants were analyzed for chromosome number, fertility, and color. All the hybrid seedlings were tetraploid and fertile. No triploids were found. Among the 30 F1 plants, 7 were green (Y11Y11Y11Y11), 17 were green-yellow (Y11Y11Y11y11), and 6 were yellow-green (Y11Y11y11y11). The segregation ratio was close to the expected 1 green: 2 green-yellow: 1 yellow-green (X(2) = 0.38; 0.90>p>0.75). From the results of this experiment, we conclude that: (1) triploids were not produced by crossing diploid ms1ms1 soybean plants with tetraploid plants; (2) tetraploid progeny can be produced from these crosses by the fusion of 2n ms1 eggs, or fusion of other 2n gametophyte cells in the embryo sac with a 2x sperm from tetraploid plants; (3) the megaspore mother cell of male-sterile plants undergoes meiotic division without cytokinesis after telophase II and forms more than the normal number of gametes, which can fuse with each other to generate tetraploid gametophyte cells.

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Accession: 007917994

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PMID: 24220891

DOI: 10.1007/BF00224382

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